hosts_in_year.sqlite.sql: query to return all hosts contributing shows
in a period (usually a year)
hosts_list.tpl: `TT²` template to generate an HTML list from the output
of hosts_in_year.sqlite.sql
make_shownotes: trivial tidying
thanks_to_hosts: Bash script to simplify the generation of the HTML
which thanks a year's hosts for their contributions
